Using overrideComponent breaks code coverage when testing with aot: true

Reproduce the issue in the generated app using angular.json, app.spec.ts, TestBed.overrideComponent, and the provided ng test --no-watch --code-coverage commands. Compare coverage before and after the override, then trace the Angular CLI test and AOT coverage entry points. Done means the override no longer makes the component template coverage inaccurate.

Command

test

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

When using TestBed.overrideComponent to stub a child component, the test code coverage is no longer accurate

Minimal Reproduction

Generate a new app with latest CLI and add a component:

npx @angular/cli@20.0.0-next.6 new aot-coverage --defaults --no-routing
cd aot-coverage
ng g c user

Use app-user in app.html:

<h1>Hello, aot-coverage</h1>
<app-user></app-user>

Edit angular.json to add "aot": true in the test section and run:

ng test --no-watch --code-coverage

Coverage is 100%

Statements   : 100% ( 12/12 )
Branches     : 100% ( 11/11 )
Functions    : 100% ( 3/3 )
Lines        : 100% ( 6/6 )

Now, in the app.spec.ts, add in beforeEach:

TestBed.overrideComponent(App, {
  remove: {
    imports: [User],
  },
  add: {
    imports: [User],
  }
});

(this happens with a proper stub of course but even removing the import and adding it back works to reproduce the issue)

Run the tests again:

ng test --no-watch --code-coverage

Coverage is now inaccurate because the template is not properly covered:

Statements   : 58.33% ( 7/12 )
Branches     : 90.9% ( 10/11 )
Functions    : 66.66% ( 2/3 )
Lines        : 66.66% ( 4/6 )

Exception or Error

Your Environment

Angular CLI: 20.0.0-next.6
Node: 22.14.0
Package Manager: npm 10.9.0
OS: darwin arm64

Angular: 20.0.0-next.7
... common, compiler, compiler-cli, core, forms
... platform-browser, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.2000.0-next.6
@angular-devkit/core         20.0.0-next.6
@angular-devkit/schematics   20.0.0-next.6
@angular/build               20.0.0-next.6
@angular/cli                 20.0.0-next.6
@schematics/angular          20.0.0-next.6
rxjs                         7.8.2
typescript                   5.8.3
zone.js                      0.15.0

Anything else relevant?

No response